21210234230 has 32 divisors (see below), whose sum is σ = 38449785024. Its totient is φ = 8423921536.

The previous prime is 21210234217. The next prime is 21210234239. The reversal of 21210234230 is 3243201212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210234239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1371119 + ... + 1386501.

It is an arithmetic number, because the mean of its divisors is an integer number (1201555782).

Almost surely, 2^21210234230 is an apocalyptic number.

21210234230 is a deficient number, since it is larger than the sum of its proper divisors (17239550794).

21210234230 is a wasteful number, since it uses less digits than its factorization.

21210234230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16360.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21210234230 its reverse (3243201212), we get a palindrome (24453435442).

The spelling of 21210234230 in words is "twenty-one billion, two hundred ten million, two hundred thirty-four thousand, two hundred thirty".